DetailPage-MSS-KB

Microsoft small business knowledge base

When you access the Microsoft Windows Update Web site from a
Microsoft Windows XP-based computer that is behind a firewall or a proxy
server, you cannot download the updates. You may also see one of the following
error messages in the upper-right corner of the Web page:

Note You can view the Windowsupdate.log file to verify whether Windows
Update or whether Automatic Updates encountered an error. By default, the
Windowsupdate.log file is configured to log messages. This log file is located
in the %Windir% folder. The %Windir% folder is the folder where Windows is
installed in your computer.

To resolve this issue, make sure that the proxy server or
the firewall is configured for anonymous access to the Windows Update Web site.
Include the following destinations when you create the destination set or the
URL set for Windows Update:

http://download.windowsupdate.com

https://*.update.microsoft.com

http://*.update.microsoft.com

http://update.microsoft.com

http://*.windowsupdate.com

http://download.microsoft.com

http://update.microsoft.com

http://ntservicepack.microsoft.com

http://wustat.windows.com

https://update.microsoft.com

http://*.download.windowsupdate.com

http://*.update.microsoft.com

https://*.update.microsoft.com

Note See the documentation for your proxy server or your firewall for
information about how to configure the proxy server or the firewall for
anonymous access.

For more information about how to configure ISA server
for anonymous access, click the following article number to view the article in
the Microsoft Knowledge Base:

885819
(http://support.microsoft.com/kb/885819/
)
You experience problems when you access the Windows Update Version 5 Web site through a server that is running ISA Server

If your proxy server or your firewall is already configured
for anonymous access, you can gather more information about the actual cause of
the error messages that are mentioned in the "Symptoms" section by using the
Network Monitor Capture Utility. You must keep the Network Monitor Capture
Utility running when you access the Windows Update Web site for the utility to
display the actual cause of the error messages.
For more information about the Network
Monitor Capture Utility, click the following article number to view the article in the Microsoft Knowledge Base: